01 - In a large mixing bowl, cream the softened butter with powdered sugar on medium speed using an electric mixer until pale and fluffy, approximately 2 minutes.
02 - Add lemon zest and vanilla extract to the creamed mixture, mixing until evenly combined.
03 - Sift together the flour and salt. Gradually add to the wet mixture, mixing on low speed until just incorporated and a soft dough forms.
04 - Divide the dough into two equal portions. Shape each into a disc, wrap in plastic wrap, and refrigerate for 30 minutes until firm.
05 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
06 - Roll out chilled dough on a lightly floured surface to 1/4-inch thickness. Cut with a 2-inch round cookie cutter and transfer half onto prepared sheets.
07 - Use a smaller cutter to remove the centers from half of the cookies. Arrange these as the tops on the baking sheets.
08 - Bake cookies for 11 to 13 minutes, or until edges are lightly golden. Cool completely on a wire rack.
09 - Stir fresh lemon juice into raspberry jam until smooth.
10 - Spread about 1/2 teaspoon of jam mixture on the flat side of each cookie base. Top with a cookie with a cutout center, gently pressing to sandwich.
11 - Optionally, dust assembled cookies with powdered sugar before serving.